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6108Re: [softrock40] Use of DDS-60

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  • T Hoflich
    Sep 18, 2006
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      For the first board that I assembled, I went the "chicken"
      method and sent the chip and board to the fellow mentioned
      in the DDS documentation. He did the "hard" work and
      returned it to me. The result was very satisfactory.
      Since then, I have been using the hot air reflow method
      using an embossing gun, coffee warmer and solder that I got
      from Cash Olsen who is on this group. This is very
      satisfactory. I looked at the old entries in this group
      and could not find the step by step documentation that I
      used to do this. Maybe someone can point you to it.

      73 Tom KM5H

      --- ian mcphedran <gm3gtq@...> wrote:

      > Hi Tom, I am trying to build a dds-60 using a 230v
      > Hexacon SMD soldering iron I bought in the U.K. from a
      > supplier of SMD parts who no longer is in business. The
      > tip is o.k. for most smd things but the 28 pin analog
      > devices chip is too closely spaced for it. Can I ask what
      > is the iron you used for your assembly work?
      > Ian Gm3GTQ
      > km5h <km5h@...> wrote:
      > I finally finished a "production" version of a
      > Softrock receiver. By
      > production, I mean everything in one box with proper
      > connectors
      > instead of a bunch of pieces scattered around the bench.
      > In the box
      > is a SR-6, a DDS-60 and a MS-DDS-60 (Controller).
      > I am using a SoundBlaster MP3+ so I can use it with any
      > computer with
      > USB (especially laptop).
      > The Rocky display looks the same with the DDS-60 or the
      > 28.224
      > crystal. The output of the DDS-60 directly replaces the
      > crystal via a
      > short piece of small coax.
      > One of the nice features of the controller is that it
      > displays 7.056
      > but actually puts out 28.224 for the SR-6.
      > You set the center frequency on the controller. Then
      > transfer that
      > number (like 7.056) on the display to the appropriate
      > field in Rocky
      > setup.
      > The DDS-60 goes to 60MHZ so this configuration will work
      > to 15 MHZ.
      > This includes lots of ham bands, short wave bands, and
      > most IF's. Now
      > I need to do some work on switching the band pass filter
      > for higher
      > frequency coverage than the "stock" SR-6.
      > Now, if Rocky only supported AM and maybe FM (hint hint).
      > There have been several questions lately about the use of
      > the DDS60.
      > I have found it very successful.
      > http://www.amqrp.org/kits/dds60/index.html
      > http://kd1jv.qrpradio.com/msdds60/msdds60.HTM
      > Tom KM5H
      > ---------------------------------
      > All new Yahoo! Mail "The new Interface is stunning in
      > its simplicity and ease of use." - PC Magazine
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